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Replaced the 12V battery, and the issue seems to have been corrected. Thanks for the advice.
The battery is years old. 4-6, I don't recall. But old enough that replacing it is almost certainly the place to start given the low voltage....
Good ideas. Brake light does come on when brake pedal is depressed. Of course, the failure is intermittent so that might not be definitive....
My 2011 Prius, which I have owned since new, has recently not been booting up properly. Instead, it has been going into accessory mode even when...